24 Pa. C.S. § 8524
The state accumulation account shall be the ledger account to which shall be credited all contributions of the commonwealth and other employers as well as the earnings of the fund, except the premium assistance contributions and earnings thereon in the health insurance account. Valuation interest shall be allowed on the total amount of such account less any earnings of the fund credited during the year. The reserves necessary for the payment of annuities and death benefits resulting from membership in the system as approved by the board and as provided in chapter 83 (relating to membership, contributions and benefits) Shall be transferred from the state accumulation account to the annuity reserve account. At the end of each year the required interest shall be transferred from the state accumulation account to the credit of the members' savings account and the annuity reserve account. The administrative expenses of the board shall be charged to the state accumulation account. Employer defined contributions, mandatory pickup contributions and a participant's voluntary contributions, together with any income or interest earned thereon, may be temporarily placed into the state accumulation account pending allocation or distribution to the participant's individual investment account.
24 Pa.C.S. § 8524